Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, 0), (1, -1, -1), (1, 0, 0)}.
A149928
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 1, 0), (1, -1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =48a(5) =166a(6) =597a(7) =2215a(8) =8510a(9) =33266a(10) =132505a(11) =537363a(12) =2202785a(13) =9140543a(14) =38334918a(15) =162006061a(16) =690358870a(17) =2962720562a(18) =12787564112a(19) =55521222256a(20) =242295294818
External references
- oeis: A149928